I've got a Danfoss TP700 and I'm connecting the RX1 receiver up to a Halstead Ace. The boiler has terminals L1 and L3 linked as it's running on the timeclock. The RX1 has L & N supply and terminal 2 as a common with 3 and 4 zone on and off. It says to connect pin 2 to mains live but I don't...